Some A code designate axle ratio and size with options such as a performance axle code or a tow package code. You tag doesn't have any of those code so in your case, no.
It probably has an 7.25 rear with either 3.55 or 3.91 gears. Can't remember what ratio came standard in /6 cars. In /6 trucks it was 3.91
Uhhh, this was after the fuel crisis! The highest ratio was 3.55 by then according to the 1974 dealership data book. And the 3.55 was only available with a sure grip which is code D91 (high isn’t on the fender tag).
The standard ratio on 225 Duster with a torque flight was 2.76 with the optional ratio being 3.23.
